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Year 11 Exam  >  Year 11 Tests  >  Test: Paper Chromatography Using Locating Agents & Separation and Purification - Year 11 MCQ

Test: Paper Chromatography Using Locating Agents & Separation and Purification - Year 11 MCQ


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10 Questions MCQ Test - Test: Paper Chromatography Using Locating Agents & Separation and Purification

Test: Paper Chromatography Using Locating Agents & Separation and Purification for Year 11 2024 is part of Year 11 preparation. The Test: Paper Chromatography Using Locating Agents & Separation and Purification questions and answers have been prepared according to the Year 11 exam syllabus.The Test: Paper Chromatography Using Locating Agents & Separation and Purification MCQs are made for Year 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Paper Chromatography Using Locating Agents & Separation and Purification below.
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Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 1
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What is the primary purpose of using locating agents in chromatography?

Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 1
Locating agents are essential in chromatography as they interact with the sample, producing a colored product that enhances visibility. This step is crucial because it helps in making the sample runs visible to the naked eye after the chromatography process is completed.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 2
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What is the primary factor that determines the selection of a separation method for substances?

Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 2
The selection of a separation method hinges on various characteristics of the substances involved, with differences in solubility playing a crucial role in determining the appropriate method. By leveraging differences in solubility, one can effectively separate substances based on their ability to dissolve in a specific solvent, leaving impurities behind. This method ensures the isolation of the desired substance from a mixture.
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Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 3
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Which technique is utilized to separate an undissolved solid from a mixture involving a liquid or solution?

Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 3
Filtration is the separation technique employed to isolate an undissolved solid from a mixture containing a liquid or solution. By utilizing filter paper in a filter funnel, the mixture is poured onto it, allowing only small liquid particles to pass through as filtrate while trapping large solid particles as residue. This method is effective in scenarios where solid-liquid separation is required.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 4
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In crystallisation, why is it essential to heat the solution initially?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 4
Heating the solution in crystallisation is crucial because it helps decrease the solubility of the solid in the hot solvent compared to a cold one. This process sets the stage for crystal formation as the solution cools down, leading to the precipitation of solids. By carefully controlling the cooling process, it becomes possible to extract purified crystals from the solution, a key step in the crystallisation technique.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 5
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What is the purpose of washing the crystals collected during the crystallisation process with distilled water?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 5
Washing the crystals with distilled water post-collection in the crystallisation process serves the crucial function of removing impurities. This step ensures that the crystals obtained are purified and free from any residual contaminants that might have been present during the crystallisation process. The use of distilled water helps maintain the purity of the crystals, preparing them for subsequent drying and use.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 6
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What is the primary purpose of using simple distillation?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 6
Simple distillation is primarily used for separating a liquid and soluble solid from a solution or for separating a pure liquid from a mixture of liquids. This process involves heating the solution to evaporate the desired substance, which then condenses back into its pure form. Simple distillation is effective for scenarios where a clear separation between components is achievable based on differences in boiling points.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 7
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In fractional distillation, what temperature is crucial for separating water and ethanol effectively?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 7
In the case of separating water and ethanol through fractional distillation, heating the mixture until it reaches 78°C is crucial. At this temperature, ethanol, with its lower boiling point compared to water, evaporates, rises, and then condenses back into a liquid in the collection beaker. This temperature point allows for the efficient separation of ethanol from the mixture.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 8
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Why is fractional distillation preferred over simple distillation for certain scenarios?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 8
Fractional distillation is favored over simple distillation in cases where there is a need to separate liquids with similar boiling points effectively. Unlike simple distillation, fractional distillation offers enhanced separation capabilities, making it ideal for scenarios where precise separation of components is necessary, especially when dealing with liquids that have close boiling points.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 9
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What safety precaution is recommended when conducting fractional distillation in the presence of flammable liquids?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 9
When performing fractional distillation in the presence of flammable liquids, it is advisable to use an electric heater for safety reasons. Electric heaters reduce the risk of accidental ignition associated with open flames, making them a safer choice for heating volatile or flammable substances during distillation processes.
Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 10
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What characteristic helps differentiate between pure substances and mixtures based on their melting and boiling points?
Detailed Solution for Test: Paper Chromatography Using Locating Agents & Separation and Purification - Question 10
The presence of sharp temperature transitions in melting and boiling points helps differentiate between pure substances and mixtures effectively. Pure substances exhibit distinct and specific melting and boiling points with sharp transitions, unlike mixtures which encompass a range of melting and boiling points due to the presence of different components with varying temperature properties.
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